There’s only so much time left to look for life on Mars before life arrives from Earth
The 51-year-old Outer Space Treaty, which obligates the U.S. and other signers to avoid the “harmful contamination” of other celestial bodies
The Tomahawk cruise missile: How Trump could strike Syria
This missile is a legend and it might be what hits Syria at any moment
Beyond the Milky Way: The sublime beauty of our galactic neighbors (AMAZING PHOTOS)
A trip through some of humanity's most spectacular galactic glimpses